Document how to set the priority on API level above 25

Issue: #7820
PiperOrigin-RevId: 328917063

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerNotificationManager.java

@@ -16,6 +16,7 @@
 package com.google.android.exoplayer2.ui;
 package com.google.android.exoplayer2.ui;
 
 
 import android.app.Notification;
 import android.app.Notification;
+import android.app.NotificationChannel;
 import android.app.PendingIntent;
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Context;
@@ -877,6 +878,10 @@ public class PlayerNotificationManager {
    *
    *
    * <p>See {@link NotificationCompat.Builder#setPriority(int)}.
    * <p>See {@link NotificationCompat.Builder#setPriority(int)}.
    *
    *
+   * <p>To set the priority for API levels above 25, you can create your own {@link
+   * NotificationChannel} with a given importance level and pass the id of the channel to the {@link
+   * #PlayerNotificationManager(Context, String, int, MediaDescriptionAdapter) constructor}.
+   *
    * @param priority The priority which can be one of {@link NotificationCompat#PRIORITY_DEFAULT},
    * @param priority The priority which can be one of {@link NotificationCompat#PRIORITY_DEFAULT},
    *     {@link NotificationCompat#PRIORITY_MAX}, {@link NotificationCompat#PRIORITY_HIGH}, {@link
    *     {@link NotificationCompat#PRIORITY_MAX}, {@link NotificationCompat#PRIORITY_HIGH}, {@link
    *     NotificationCompat#PRIORITY_LOW} or {@link NotificationCompat#PRIORITY_MIN}. If not set
    *     NotificationCompat#PRIORITY_LOW} or {@link NotificationCompat#PRIORITY_MIN}. If not set